150 NOTICES OF NORTH AMERICAN FUNGI. 



- Thelephora incrustans. P.— No. 570. Car. Sup. 



* * Thelephora sebacea. Fr.-No. 4872. Penns., Michener, No. 



'5821. New Eng., Sprague. Kav. No. 1619. Car. Inf. 



* Thelephora pedicellata. Schwein — -No. 3807. Alabama, Peters. 

 On Cornus. 



* Thelephora arida. Fr.— No. 2362. Car. Inf. On pine. 



T 225. Thelephora Murraii. B. <L- C. — Journ. Linn. Soc, x.,p. 329. 

 Effusa, carnoso-crustacea ; margine angusto tomentoso pallido ; 

 hymenio rimoso granulato ; ex albido subcarneo-griseo. No. 5809, 

 New Eng., Murray. Also Cuba. 



Effused, of a thick, rather fleshy substance, margin pallid, narrow, 

 tomentose, hymenium cracked, granulated, at first whitish, then of 

 a greyish flesh-colour. 



fri" 



ON SEXUAL REPRODUCTION IN THE 

 PERONOSPORiE. 



By Dr. Ant. de Bary.* 



[At this time, when attention is directed more specially to the 

 Potato Disease, on account not only of its devastations, but also 

 of the prize which has been offered for its elucidation, the follow- 

 ing observations may be opportune.] 



In the form and initial mode of development of their sexual 

 organs, the Feronosporce are completely analogous to the monse- 

 cious types of the Saprolegnice. It is in the intercellular spaces 

 of the living phanerogamic plants, inhabited by these parasites, 

 that we find their oogonia, which are large, rounded cells, filled 

 with plasma. These cells generally terminate certain branches of 

 the mycelium, and are only rarely interstitial. Long before the 

 oogonium has reached its normal dimensions, there springs from 

 the filament which bears it, or from some other neighbouring one, 

 a slender branch, which is firmly applied by its free extremity to 

 the walls of the said organ. Then this branch ceases to elongate, 

 its extremity inflates, takes a basilary division, and thus becomes a 

 distinct cell, a clavate, or oval antheridium, which is straight, and 

 of less diameter than the oogonium, firmly applied to the latter by 

 a relatively extensive surface. I have never met with an adult 

 oogonium which was certainly without an antheridium, and I have 

 only very rarely seen oogonia with two antheridia. 



When the two sexual organs have attained their full develop- 

 ment, the protoplasm contained in the oogonium is divided into a 

 peripheric layer, with but few granules, and almost homogeneous ; 

 and into a central rounded mass, which is rendered opaque by 



* Translated from " Morphologie und Physiologie der Pilze," in Hofmeister's 

 " Handbuch," vol. ii., cap. v. By the Editor. 



